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What is a Shunt Trip Breaker and How Does It Work?

Written by  Edwin Jones  / Fact checked by  Andrew Wright

What is a shunt trip breaker? Does it add protection to your electrical system?

The shunt trip breaker is a combination of the shunt trip accessory and the main circuit breaker. This installs on the main breaker to add protection to your electrical system. This adds security to your electrical system as it manually or automatically cuts the electric supply in your circuit.

This accessory can help prevent short circuits and avoid electrical damage should a disaster occur in your home.

Let me tell you more about the shunt trip breaker to help you decide if you need additional protection for your electrical system.

Table of Contents

What is Shunt Trip Breaker and How Does It Work

Where are shunt trip breakers most used, how to install a shunt trip accessory to the breaker.

You should know that shunt trip breakers are different from GFCI circuit breakers.

The GFCI circuit breaker contains one big white tail wire for neutral connections only. It cannot be connected to any control package because the GFCI circuit breaker is solely designed to detect a sudden electrical surge. It has no other purpose but to cut power in case of a short.

Meanwhile, the shunt trip breaker wiring comprises two wires. One connected to the ground, and another to a control system. The control system can be connected to a sensor or to a manual switch. When activated, the shunt trip accessory will cause the main breaker to trip.

For example, if you install a shunt trip with a smoke detector, it will activate and cut off the power should the smoke sensor trigger. It can also be installed with a remote switch , allowing you to trip your breaker manually.

It is crucial to know the difference between a regular circuit breaker and a circuit breaker installed with shunt trip accessories.

The shunt trip definition means that it is a way to cut off electrical power through other sensors, not just via thermal activation. Since this is an optional accessory for a circuit breaker, it is not required for a home electrical system.

However, it is recommended for added safety. This is especially true if you’re working with industrial machinery. Furthermore, you can use it as a manual emergency switch to shut down your main breaker.

Before installing a shunt trip, consider its cost and your existing system. You may need to change the breaker panel  and circuit breakers, especially if it is not compatible with shunt trips. You may also need a new line to connect the remote emergency switch to your breaker box.

Generally, most commercial kitchens, elevators, and offices have this shunt trip breaker because it is required. Commercial kitchens use this device in compliance with ANSI/ASME CSD-1, while elevators and escalators comply with ASME A17.1. These codes refer to the controls and safety standards provided by ASME’s.

This question is a topic of discussion among Reddit members as well. Join the conversation here:

Found at a dominos by u/Guilty_Sympathy_496 in electricians

Mostly, installing a shunt trip relay requires that the breaker and the shunt be from the same maker. Also, not all breaker models are compatible with this accessory.

Once you’re sure that your system can take a shunt trip accessory, installation is pretty much straightforward. You can watch this video by Aaron CBIONE for some tutorials.

Note: Every circuit breaker comes with different instructions. It would depend on the brand and model of the breaker .

However, the critical part of every installation is that you need to connect the shunt to your sensor. You may need a shunt trip breaker diagram as a reference to ensure correct installation.

Also, check the brand and model of your breaker before proceeding with the installation. Some makers only allow a factory install of the shunt trip and other accessories. DIY installation may void the warranty of your breakers. It’s best to read up on the manual or consult an electrical professional before making any changes.

What is a shunt trip breaker? The shunt trip is an optional accessory for a circuit breaker for added protection to your system. It is designed to connect to a secondary sensor. It will trip the breaker automatically if the sensor is triggered. It can also be activated via a remote switch that you can install.

Do you think that a circuit breaker is enough to protect your investment? Or do you want an additional layer of protection for your electrical circuit? If you’re not decided yet, reach out to me in the comments section below, and I will be happy to help you.

I am Andrew Wright. With 8 years of experience designing, installing, and maintaining electrical power systems. I love my job, and I have always wanted to offer others the necessary help so they can take care of their houses.

• Electrical , How To & Guides

Shunt Trip Breaker Explained: What It Is And How It Works

• August 26, 2024

Electrical safety is a priority, but understanding all the components involved can be challenging. If you’ve heard of a shunt trip breaker but aren’t sure what it does, you might be missing a key piece of the puzzle. This lack of knowledge can lead to unsafe installations or unexpected issues down the road. In this blog post, we’ll explore what a shunt trip breaker is, how it operates, and why it’s a critical component in maintaining electrical safety.

What Is A Shunt Trip Breaker?

A shunt trip breaker is a special type of circuit breaker that can disconnect power remotely. It has a built-in mechanism that can be triggered from the outside to break the circuit. This feature is important for handling electrical hazards and maintaining safety in various settings.

The key function of a shunt trip breaker is its ability to trip or shut off when it gets an external signal. This signal can come from devices like smoke detectors, gas sensors, or emergency stop buttons, making it useful in many safety applications.

Shunt trip breakers are often used in systems where an emergency power cutoff is needed to prevent fires, equipment damage, or other safety risks. Their design allows for a quick response to emergencies, adding an extra layer of safety to electrical circuits . Using a shunt trip breaker helps ensure that power can be safely and quickly turned off when needed.

How Does A Shunt Trip Breaker Work?

A shunt trip breaker combines mechanical and electrical elements, enabling it to respond to external signals to trip. The key part is the shunt trip coil, an electromagnet linked to an external control circuit.

When an external signal is sent to the breaker, it energizes the shunt trip coil. This energy flow generates a magnetic force that triggers the breaker’s tripping mechanism, which immediately separates the contacts, cutting off the power and isolating the connected circuit.

This function is crucial in situations where manual intervention might be too slow or automated safety responses are needed. It ensures power can be quickly and safely cut in response to emergency signals, such as fire alarms or other safety system triggers.

Shunt trip breakers enhance safety by allowing electrical circuits to be swiftly deactivated from remote locations, improving the overall safety of electrical installations.

What Is A Shunt Trip Circuit Breaker?

A shunt trip circuit breaker works like a regular circuit breaker but with a special feature for remote tripping. It has a shunt trip device that can be triggered by an external signal. This feature adds safety by allowing the breaker to trip under specific external conditions, not just electrical faults.

The external signal might come from a fire alarm, gas detector, or other safety systems. When the signal is received, the shunt trip device activates and trips the breaker. This quick action helps prevent disasters by cutting off power immediately when needed.

Shunt trip circuit breakers are common in commercial and industrial settings where quick power disconnection is vital for safety and compliance with regulations.

Types Of Shunt Trip Breakers

Shunt trip breakers can be classified into two main types based on how they are triggered:

• Manual Shunt Trip Breakers : These require someone to manually activate them. They have a control switch or button that, when pressed, sends a signal to trip the breaker remotely. This type is common in systems where personnel need to control and intervene directly.
• Automatic Shunt Trip Breakers : These trip the breaker automatically in response to specific conditions, like a fire alarm or gas detector. They are crucial in environments where immediate action is needed to ensure safety, without relying on human intervention.

Both types are designed to enhance electrical safety, but their use depends on whether manual control or automatic response is more suitable.

Benefits Of A Shunt Trip Breaker

Shunt breakers offer key benefits that make them vital in today’s electrical systems. Here’s what sets them apart:

• Remote Shut-Off Capability: Shunt trip breakers can disconnect power remotely. This feature allows quick shutdowns from a distance, which is helpful during emergencies like fires or gas leaks. Remote shut-off means power can be cut without entering dangerous areas, boosting safety.
• Enhanced Safety And Protection: Shunt trip breakers add another safety layer by automatically disconnecting power when triggered by external signals. This quick response helps prevent accidents and equipment damage, which is crucial in environments where safety is key.
• Ease of Installation And Integration: Installing a shunt trip breaker is easy and fits well into existing electrical systems. This simplicity cuts down on installation time and costs, making it an efficient way to improve system safety.
• Cost-Effective Solution: Shunt trip breakers prevent damage and reduce the risk of hazards, making them a cost-effective safety option. They protect expensive equipment and minimize downtime in emergencies, leading to long-term savings.
• Versatile Compatibility: Shunt trip breakers work with various electrical systems and safety devices. This versatility makes them suitable for residential, commercial, and industrial use. Their ability to integrate with different systems ensures they can be used effectively in many environments.
• Automated Emergency Response: Shunt trip breakers are vital where quick, automated actions are needed. They can be set to react to signals from devices like smoke detectors or heat sensors. This means they can cut off power on their own, reducing human mistakes and speeding up danger control. This boosts safety in the facility.

Where Are Shunt Trip Breakers Frequently Used?

Shunt trip breakers are essential in environments where safety and emergency power control are top priorities. You’ll frequently find them in the following settings:

• Commercial Kitchens: Shunt trip breakers help prevent fires by disconnecting power in case of gas leaks or other hazards.
• Industrial Sites: They ensure quick power cutoffs during emergencies, protecting equipment and personnel from electrical accidents.
• Healthcare Facilities: In hospitals and clinics, shunt trip breakers are vital for maintaining safety by instantly shutting down power in critical areas if needed.
• Data Centers: These breakers protect sensitive equipment from damage by automatically cutting power during emergencies.
• Educational Institutions: Schools and universities use shunt trip breakers to enhance safety, especially in laboratories and other high-risk areas.
• Elevator Systems: Shunt trip breakers are used to safely shut down elevators in case of emergencies, such as fire or power failure.

Also check:

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• Double Tapped Breaker – How To Fix?
• How To Fix “Air Conditioning Breaker Keeps Tripping” Issue?
• What Causes An Arc Fault Breaker Tripping – How To Fix It?

When choosing a shunt trip breaker, consider the size of the facility and the availability of personnel. For smaller buildings with staff on hand, a manual shunt trip breaker may be sufficient. In larger buildings or where immediate access is limited, an automatic breaker is more suitable. Additionally, a shunt trip relay can integrate with fire alarms or emergency systems, allowing remote tripping during emergencies for enhanced safety.

Installing a shunt trip breaker is generally recommended to be done by a qualified electrician. It requires knowledge of electrical systems and safety procedures.

A standard circuit breaker relies on thermal or magnetic elements to trip when an overload or short circuit occurs. A shunt trip breaker, on the other hand, is externally controlled and can be tripped independently of the current flowing through the circuit.

While primarily used in commercial and industrial settings, shunt trip breakers can be used in residential applications for specific purposes, such as generator interlock systems or fire safety systems. However, they are less common in homes compared to standard circuit breakers.

While shunt trip breakers offer many advantages, they may not be suitable for all applications. Factors such as the required tripping speed, fault current levels, and environmental conditions should be considered when selecting a breaker.

A shunt trip circuit breaker is key to improving electrical safety, enabling quick and remote power disconnection during critical situations. This feature is especially important in environments where immediate action is necessary to prevent accidents. Integrating this device enhances safety and protection in both commercial and industrial systems.

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• What Is a Shunt Trip Breaker and How Does It Work

What Is a Shunt Trip Breaker and How Does It Work?

First things first: what is a shunt trip breaker? A shunt trip breaker is a specialized circuit breaker that is designed to remotely shut off power to a circuit in emergency situations, such as a fire or security breach. These breakers are commonly used in commercial and industrial buildings, as well as other facilities where safety is a top priority. In this article, we'll explore this type of breaker in detail and explain why hiring an  electrical services provider for a wiring shunt trip breaker is essential. 

The Many Benefits of a Shunt Breaker

Let’s recap: a shunt trip breaker is an electrical component connected to a circuit breaker and allows for remote operation through a schematic and AMP connection. Now that you know what a shunt trip circuit breaker is, it's time to move to the next part of this article: the benefits of using a shunt breaker.

• Remote Shut-Off: One of the main benefits of shunt breakers is that they can be remotely shut off in the event of an emergency. This allows them to quickly and easily disconnect power in a fire or other emergency, which can help prevent damage to the building and protect the occupants.
• Increased Safety: Besides remote shut-off, shunt trip circuit breakers provide an added level of safety and security by automatically shutting off power to a circuit in the event of an emergency. This helps prevent electrical fires and other hazards, protecting both people and property.
• Easy Installation: Shunt breakers are relatively easy to install and can be integrated into existing electrical systems, making it possible to retrofit older buildings with these devices.
• Cost-Effective: A shunt breaker is a cost-effective solution for increasing safety and security in commercial and industrial buildings. They are relatively inexpensive to purchase and install and can help prevent costly damage to the building and its contents in case of any emergency.
• Compatibility: Shunt breakers are compatible with a wide range of electrical systems and devices, making them a versatile and practical solution for increasing safety in various settings.

How Does a Shunt Trip Breaker Work?

A shunt trip breaker works by tripping the breaker when it receives a signal from an external device, such as a fire alarm or security system. This helps to prevent dangerous electrical fires or other hazards. When an emergency occurs, the external device sends a signal to the breaker, which causes the breaker to trip and open the circuit, interrupting the flow of electricity and preventing power from reaching the circuit, allowing for a quick and easy power disconnection.

Types of Shunt Trip Breakers

Now that you know the answer to "How does a shunt trip breaker work", it's time to discover about the two main types of shunt trip breakers.

• Manual Shunt Trip Breaker: This type of trip breaker requires manual intervention to reset the breaker after it has been tripped, meaning someone must physically go to the breaker and reset it after an emergency situation. This breaker is typically used in smaller residential buildings or situations where a dedicated staff member is available to reset the breaker.
• Automatic Shunt Trip Breaker: This type of breaker can automatically reset itself after being tripped and is typically used in larger buildings or in situations where there is not always someone available to reset the breaker. These breakers are often connected to fire alarm systems or other emergency management systems for auto-reset.

When is a Shunt Trip Breaker Required?

If you're wondering when is a shunt trip breaker required, know that it is required in any electrical system where there is a need to quickly and easily shut off power in the event of an emergency, such as a fire or security breach. Continue reading as we describe the importance of using shunt trip breakers and how to figure out which one you need to use for your building or facility.

The Importance of Using a Shunt Trip Breaker

• Shunt trip breakers automatically shut off power in emergencies.
• They prevent dangerous electrical fires and other hazards.
• They allow for quick and easy power disconnection in emergencies.
• They are easy to install and cost-effective solutions for increasing safety.
• They can be connected to fire alarm and emergency management systems.
• They ensure that the electrical system is in compliance with safety regulations.
• They are a versatile and practical solution for increasing safety in various settings.

Which Type of Shunt Trip Breaker to Use?

A manual breaker may be appropriate for a smaller building or in situations with a dedicated staff member available to reset the breaker, while an automatic breaker may be more appropriate for a larger building or in situations where someone is not always available to reset the breaker. Another option to consider is the use of a shunt trip relay, which can be used to trigger a shunt trip breaker remotely. These relays are typically connected to fire alarm systems or other emergency management systems and can send a signal to the breaker to trip it when an emergency occurs.

Shunt Trip Breaker Wiring Diagram

If you're wondering how to wire a shunt trip breaker, know that wiring can seem like a daunting task, but with the right knowledge and tools, it can be done relatively easily. Follow the steps below:

• Obtain a "How to wire a shunt trip breaker wiring diagram." (Check above).
• Gather necessary tools and materials such as wire strippers, nuts, and a voltage tester.
• Disconnect the power and wire the shunt breaker according to the instructions provided.
• Reconnect power to the circuit and test the breaker to ensure it works properly.

It is important to pay close attention to the diagram and follow the instructions carefully. This will ensure that the breaker is wired correctly and functions. Once the wiring is complete, you can reconnect the power to the circuit and test the breaker to ensure that it is working properly. It is always better to consult with a professional if you aren't confident about the wiring process. 

What Does a Shunt Trip Breaker Do?

We hope by now you know what does a shunt trip breaker do, but here's a recap: a shunt trip breaker is a specialized circuit breaker that protects your house electrical systems from damage or hazards in emergencies. It works by tripping the breaker when it receives a signal from an external device, such as a fire alarm or security system, preventing dangerous electrical fires or other regular hazards.

Nevertheless, it is important to understand what does shunt mean in electrical terms and the role of electrical shunt trip breakers in commercial and industrial settings. Finally, to determine the appropriate type of breaker for your specific needs, it is best to consult an electrical services provider. If you're based in Colorado or surrounding areas, McCarrick Electric has got you covered.

Superior Electrical Solutions in Colorado 

At McCarrick Electric, we have 25+ years of experience providing top-quality electrical services in Colorado. We value all of our customers, and that's why we offer a 15% discount for first-time residential clients and veterans. We take pride in our integrity, attention to detail, and cost-effectiveness. For more information, connect with us via our contact form or give us a call.

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

Why are Class J fuses used instead of RK1?

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Applications

• Elevator circuits
• Data processing rooms
• Building emergency systems

Features/Benefits

• Pre-engineered single unit, which makes procurement easier than systems with multiple components
• Reduces labor costs up to 66% and total installation costs by over 30%
• Pre-installed UL listed Class J fuse holder – unique
• Class J size eliminates the need for any rejection type fuse clips
• Optional features offer flexibility for a variety of applications
• Control power terminal block
• UL Listed package
• Cu and AI wire rated
• Pre-wired control circuits lower installation time
• Lockable operating handle meets all code and safety requirements (Accepts up to 3 locks)
• Every unit is fully tested before delivery
• Control power transformer with fuses and blocks
• Fire safety interface relay
• Key to test switch
• Pilot light ”On”
• Isolated neutral lug
• Mechanical interlock auxiliary contact for hydraulic elevators with automatic recall (5 amp 120 Vac rated)
• Fire alarm voltage monitoring relay
• Option to bypass alarm when performing maintenance (-AZ option)
• XPress-Ship™ service offers 48 Hours direct shipment service on select fully loaded LPS POWR-Switches

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• Industrial & Scientific
• Industrial Electrical
• Controls & Indicators
• Industrial Switches
• Key Operated Switches

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Mersen ES Fusible Shunt Trip Disconnect Switch, 100 Ampere, 208VAC, 120VAC Coil, Keyswitch, Red Pilot Light, 30-60A Isolated Neutral Lug, 1 Form C Auxiliary Contact, NEMA 1 Standard Enclosure

Delivery & support.

• This item will be shipped by the seller. To learn more about this seller’s shipping methods, visit the link below and look for the tab called “Shipping”. You will be able to track your Amazon order in your orders . If you need more help with tracking your package, please visit Track Your Package .
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• This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. You may receive a partial or no refund on used, damaged or materially different returns.

Purchase options and add-ons

About this item.

• Fused switch provides high current limitation and short circuit withstand
• Padlockable handle allows panel to be locked with switch in the off position ensuring load side power isolation during servicing
• Shunt trip allows for remote tripping of the main line power prior to the application of water in elevator
• Sprinkler system applications
• Applications: elevators, building emergency systems, data processing rooms and miscellaneous fusible shunt trip applications

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Product details

• Item Weight ‏ : ‎ 1 Pounds
• Date First Available ‏ : ‎ September 13, 2013
• Manufacturer ‏ : ‎ Mersen
• ASIN ‏ : ‎ B00F5FO8KI
• #260 in Key Operated Switches

Product Description

Mersen engineered switch offer modular industrial control panels featuring a fusible shunt trip to allow for remote disconnection. An array of available options allows for maximum functionality to be built into a single compact panel. Panels built for elevator applications feature control transformers (fusing both primary and secondary sides), a fire safety interface relay with a fire alarm voltage monitoring relay and mechanically interlocked auxiliary contacts. Use of Mersen’s Amp-Trap 2000 AJT Class J fuses permits easy selectivity coordination, while providing the panel and its components with superior current limitation and the ability to withstand high fault conditions. AJT fuses provide added system reliability since no maintenance or periodic testing is required as with other electromechanical overcurrent devices. 3-Pole fused switch. 120 VAC shunt trip. Class J fuse block (fuses not included). Ground lug as per NEC. Control power brought to terminals. Modular components. NEMA 1 Industrial enclosure standard. Optional features: Industrial control circuit transformer. Industrial control circuit transformer primary 208VAC. Fire safety relay for control interface (3PDT Relay, Coil Voltage: 120VAC. Oil-tight key switch to test 2 position selector switch. Oil-tight power enabled power light Red. 30-60A Isolated neutral lug 100 percent. Auxiliary and alarm contacts are both Form C contacts. The auxiliary contacts change state when the switch is in the on position. Alarm contacts change state when the switch is in the tripped position. The alarm contact is located in place of the second auxiliary contact. 1 form C auxiliary contact. NEMA 1 standard enclosure. Approvals: UL 489 molded-case switch. UL 50. UL 4248. UL / cUL listed control panel. 100 Ampere rating. Measures 20-inches Width by 24-inches height by 8-inches depth.

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Elevator Switches

Mersen’s Type ES Elevator switches are designed for commercial applications where safety, high performance and continuity of service are essential. 

Mersen’s Elevator Switches are available in 30-400 amps and 208VAC, 240VAC, 480VAC, 600VAC. They have 5 enclosure types, NEMA Type 1 (indoor), Type 3R (outdoor), Type 4 and 4X (water and dust-tight, corrosion resistant), and Type 12 (drip and dust-tight). They are UL 98 and cUL 508A listed. 

Features & Benefits

Best suited for commercial applications.

Fire safety relay for control interface (3 PDT relay with choice of coil voltage).

Oil-tight key switch to test 2 position selector switch.

Oil-tight power enabled indicator light (green, red or white).

Isolated lug neutral (100% or 200%)

Auxiliary and alarm contacts (Form C).  Auxiliary contacts change state when switch is in ON position. Alarm contacts change state when switch is in tripped position

Rotary ON/OFF handle.

Accepts padlock in OFF position.

Suitable for Class J fuses.

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Publications

• Application and Technical

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Engineered Fusible Shunt Trip Disconnect

Ferraz Shawmut’s Engineered Switches offer modular industrial control panels featuring a fusible shunt trip to allow for remote disconnection. An array of available options allows for maximum functionality to be built in a single compact panel. Panels built for elevator applications feature control transformers (fusing both primary and secondary sides), a fire safety interface relay with a fire alarm voltage monitoring relay and mechanically interlocked auxiliary contacts. Use of Ferraz Shawmut’s Amp-Trap 2000® AJT Class J fuses permits easy selectivity coordination, while providing the panel and its components with superior current limitation and the ability to withstand high fault conditions. AJT fuses provide added system reliability since no maintenance or periodic testing is required as with other electromechanical over-current devices.

• Industrial Control circuit transformer Primary (208, 240, 480 or 600 VAC)
• Fire safety relay for control interface (DPDT Relay, choice of Coil Voltage: 120 VAC, 24 VDC or 24VAC)
• Oil-tight Key Switch to test 2 position selector switch.
• Oil-tight Power enabled power light (choice of lens colors: Red, Green, White or Yellow) to terminals Isolated neutral lug – 100%.
• Oversized 200% for excessive Non-Linear loads.
• Auxiliary and Alarm Contacts are both Form C contacts. The Auxiliary contacts change state when the switch is in the on position. Alarm contacts change state when the switch is in the tripped position. The Alarm contact is located in place of the second auxiliary contact.
• NEMA 12, 3R, 4 or 4X enclosure available.
• Fused switch – provides high current limitation and short circuit withstand
• Padlockable handle – permits panel to be locked with switch in the off position ensuring load side power isolation during servicing
• Shunt trip – permits for remote tripping of the main line power prior to the application of water in elevator sprinkler system applications

Part Numbers

• Browse Product Data for part numbers & product information
• AC: 600 VAC: 30A, 60A, 100A, 200A &400A , Withstand rating: 200kA I.R.
• UL 1087 Molded-Case Switch
• NEMA 1, 12, 3R, 4, 4x
• UL/cUL Listed Control Panel
• Building emergency systems
• Data processing rooms
• Miscellaneous fusible shunt trip applications

• Request Fuse
• Credit Application
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• Ultrasafe Fuseholders
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• Low-Voltage Disconnects
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• Overvoltage Protection
• Miniature/Glass Fuses
• Accessories

Ferraz products distributed by Gross Automation | Brookfield, WI | Phone: (262) 252-1600 Fax: (262) 252-1616

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